If the 165mm don't work, you might consider crank shorteners until you can work up to the 165mm, or just to get an idea how short you may need to go.

I'm fairly short, 5' with a 25" inseam and have flexibility issues. I hadn't ridden a bike in 30 years and needed to get an idea how short I needed to go, so I tried crank shorteners initially.

BTW, I am now riding with Ultegras shortened to 144mm